Great thread. Thanks to everyone for adding the details. My Craftsman #2 has always worked well for doing adjustments, but I have noticed the not so tight fit that I have with most phillips head slots. Now I know why. Extra thanks for the drawing showing the differences between the two.

Yep, time for some more screwdrivers. I'll tease the snap-on man with that I'm sure he doesnt know about JIS.

-SP